Depth finder

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1989-06-05

1992-06-16

Walsh, Donald P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03270262

REFERENCES:
patent: D98684 (1936-02-01), Langsner
patent: D141707 (1945-06-01), Snyder
patent: D252501 (1979-07-01), Yamauchi
patent: D253047 (1979-10-01), Morgan
patent: D254656 (1980-04-01), Suwa
patent: D258911 (1981-04-01), Sandel
patent: D264824 (1982-06-01), Sandel
patent: 2654156 (1953-10-01), Boyer
patent: 2689408 (1954-09-01), Cornell
patent: 2884784 (1959-05-01), Jawett
patent: 3874237 (1975-04-01), Zwarts
patent: 4141310 (1979-02-01), Rich, Jr.
patent: 4473952 (1984-10-01), Mairiani

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